docs(#200): add k3s pod api example

[bbortt]

reproducer for #200.. let's see if I am the honk 😜

[bbortt]

whoever approved the workflow beforehand; thanks. can you please do it again?

I was unable to build this community modules project locally up until now, but managed to do so now. for anyone running into problems with rdkafka on windows ("this is not an x32 architecture"), try adding the cmake build:

rdkafka = { version = "0.36", features = ["cmake-build"] }

cc: @DDtKey

[DDtKey]

Thank you for the contribution and example! 🙏

whoever approved the workflow beforehand; thanks. can you please do it again?

Done ✅

[bbortt]

@DDtKey here come some more findings..

I did only manage to run multiple tests using k3s in serial, not parallel mode. I therefore had to add the test_serial create to the dev-dependencies.

if you don't do that and run the tests in parallel you'll run into the exact same error that happened in the last "test (stable)" job. it's quit reproducible! I think in around 10 times I ran it locally it never passed.

on the other hand, the error initially reported in #200 did no longer occur. that's good 😉 however, that also means I have to double-check the code in my other project - that's less good haha

finally, I've used the busybox image for the test. I think it's less "random" and quit known. it's also only around 1.5 MB in size, so sufficiently small to not really slow down the ci imo. what do you think of it?

and finally, thanks for all your patience! it's my first rust project contribution ❤️ I've already learned a lot again.

edit: one addition; maybe the documentation should be completed with the hint that there seem to be problems with running tests using k3s in parallel? I could add that.